单项选择题

One may assume from this article that pigs ______.

A．have remained unchanged for centuries
B．are naturally vicious animals
C．make a significant contribution to modem life
D．are better than any other animal for laboratory

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单项选择题

Some anatomical features of a pig are similar to those of a human. Therefore, ______.

A．pigs can live as long as people
B．pigs are becoming popular as movie and TV stars
C．medical research on pigs helps humans
D．pigs and people naturally get fat

单项选择题

The expression hog-wash means ______.

A．untamed
B．unclean
C．uncouth
D．untrue